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This type represents a collection of object properties and does not have an explicit JavaScript representation.

type =
The ASCII-encoded string in lower case representing the media type of the Blob. For File objects that are returned from the underlying file system, user agents must return the type of a Blob as an ASCII-encoded string in lower case, such that when it is converted to a corresponding byte sequence, it is a parsable MIME type [MIMESNIFF], or the empty string -- 0 bytes -- if the type cannot be determined.
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